crun: 0.20.1 -> 0.21

https://github.com/containers/crun/releases/tag/0.21

pkgs/applications/virtualization/crun/default.nix

···
 in
 stdenv.mkDerivation rec {
   pname = "crun";
-  version = "0.20.1";
+  version = "0.21";
 
   src = fetchFromGitHub {
     owner = "containers";
     repo = pname;
     rev = version;
-    sha256 = "sha256-Fo8UCUwZ5RiJTXs1jWn1Mwq2qvK8p++ETxW9Tseokjw=";
+    sha256 = "sha256-PhhaCXtWsknMsEt1F9jMfEWSl+OLQ/C/iTj7t0XuAFw=";
     fetchSubmodules = true;
   };